This manga deals with the history of a teenage, Tobi Shima Sen, who has lost his father and lives with his mother. He is a scrapper but his mother has no authority on him. In order to educate him, she decides to sent him to a man who is a boxing coach during the holidays/vacation.

Included one-shots:
Volume 1: Nakkumoe
Volume 2: Kick! Kouta!!, Fukuwajutsu